US 9,755,118 B2Granted

Light-emitting device, method for designing light-emitting device, method for driving light-emitting device, illumination method, and method for manufacturing light-emitting device

AssigneeCitizen Electronics Co., Ltd.

InventorHideyoshi Horie

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Abstract

An object of the present invention is to provide a light-emitting device that can implement a natural, vivid, highly visible and comfortable appearance of colors and appearance of objects as if the objects are seen outdoors, and to provide a light-emitting device that can change the appearance of colors of the illuminated objects so as to satisfy the requirements for various illuminations, and a method for designing thereof. Another object of the present invention is to improve the appearance of colors of a light-emitting device which currently exists or is in use, and which includes a semiconductor light-emitting device of which appearance of colors is not very good. Moreover, another object of the present invention is to provide a method for driving the light-emitting device, an illumination method by the device, and a method for manufacturing the light-emitting device. These objects are achieved by the light-emitting device that incorporates light-emitting elements and satisfies predetermined requirements, in which φSSL (λ) emitted from the light-emitting device satisfies a predetermined condition.

Claims39

Dependent claims

A light-emitting device which includes M number of light-emitting areas (M is 2 or greater natural number) and has light-emitting elements in the light-emitting areas, wherein

when φSSL(λ) (N is 1 to M) is a spectral power distribution of a light emitted from each light emitting area in a main radiant direction of the light-emitting device, and φSSL(λ), which is a spectral power distribution of all the lights emitted from the light-emitting device in the radiant direction, is represented by
ϕ
SSL
⁡
(
λ
)
=
∑
N
=
1
M
⁢
ϕ
SSL
⁢
N
⁡
(
λ
)
,
the light-emitting device includes light-emitting areas that allow φSSL(λ) to satisfy the following Condition 1′:
Condition 1′:
light emitted from the light-emitting device includes, in the main radiant direction thereof, light whose distance DuvSSL from a black-body radiation locus as defined by ANSI C78.377 satisfies −0.0350≦DuvSSL<0;
and
wherein the light-emitting device includes the light emitting areas that allow φSSL(λ) to further satisfy the following Conditions 3′ by changing a luminous flux amount and/or a radiant flux amount emitted from the light emitting areas:
Condition 3′:
if an a* value and a b* value in CIE 1976 L*a*b* color space of 15 Munsell renotation color samples from #01 to #15 listed below when mathematically assuming illumination by the light emitted in the radiant direction are respectively denoted by a*nSSL and b*nSSL (where n is a natural number from 1 to 15), and
if an a* value and a b* value in CIE 1976 L*a*b* color space of the 15 Munsell renotation color samples when mathematically assuming illumination by a reference light that is selected according to a correlated color temperature TSSL (K) of the light emitted in the radiant direction are respectively denoted by a*nref and b*nref (where n is a natural number from 1 to 15), then each saturation difference ΔCn satisfies
−3.8≦ΔCn≦18.6 (where n is a natural number from 1 to 15), and
an average saturation difference represented by formula (3) below satisfies formula (4) below and
∑
n
=
1
15
⁢
⁢
Δ
⁢
⁢
C
n
15
,
(
3
)
1.0
≦
∑
n
=
1
15
⁢
⁢
Δ
⁢
⁢
C
n
15
≦
7.0
,
(
4
)
where ΔCn=√{(a*nSSL)2+(b*nSSL)2}−√{(a*nref)2+(b*nref)2}
with the 15 Munsell renotation color samples being:
#01
7.5P 4/10
#02
10PB 4/10
#03
5PB 4/12
#04
7.5B 5/10
#05
10BG 6/8
#06
2.5BG 6/10
#07
2.5G 6/12
#08
7.5GY 7/10
#09
2.5GY 8/10
#10
5Y 8.5/12
#11
10YR 7/12
#12
5YR 7/12
#13
10R 6/12
#14
5R 4/14
#15
7.5RP 4/12.

100 more elements

An illumination method comprising:

illuminated objects preparation step of preparing illuminated objects;
and
an illumination step of illuminating the objects by light emitted from a light-emitting devices which includes M number of light emitting areas (M is 2 or greater natural number) and has light-emitting elements in the light-emitting areas,
in the illumination step, when light emitted from the light-emitting devices illuminate the objects, the objects are illuminated so that the light measured at a position of the objects satisfies <1′> and <2′> below:
<1′> a distance DuvSSL from a black-body radiation locus as defined by ANSI C78.377 of the light measured at the position of the objects satisfies −0.0350≦DuvSSL<0;
and
<2′> if an a* value and a b* value in CIE 1976 L*a*b* color space of 15 Munsell renotation color samples from #01 to #15 listed below when mathematically assuming illumination by the light measured at the position of the objects are respectively denoted by a*nSSL and b*nSSL (where n is a natural number from 1 to 15), and
if an a* value and a b* value in CIE 1976 L*a*b* color space of the 15 Munsell renotation color samples when mathematically assuming illumination by a reference light that is selected according to a correlated color temperature TSSL (K) of the light measured at the position of the objects are respectively denoted by a*nref and b*nref (where n is a natural number from 1 to 15), then each saturation difference ΔCn satisfies
−3.8≦ΔCn≦18.6 (where n is a natural number from 1 to 15), and
an average saturation difference represented by formula (3) below satisfies formula (4) below and
∑
n
=
1
15
⁢
⁢
Δ
⁢
⁢
C
n
15
,
(
3
)
1.0
≦
∑
n
=
1
15
⁢
⁢
Δ
⁢
⁢
C
n
15
≦
7.0
,
(
4
)
where ΔCn=√{(a*nSSL)2+(b*nSSL)2}−√{(a*nref)2+(b*nref)2}
with the 15 Munsell renotation color samples being:
#01
7.5P 4/10
#02
10PB 4/10
#03
5PB 4/12
#04
7.5B 5/10
#05
10BG 6/8
#06
2.5BG 6/10
#07
2.5G 6/12
#08
7.5GY 7/10
#09
2.5GY 8/10
#10
5Y 8.5/12
#11
10YR 7/12
#12
5YR 7/12
#13
10R 6/12
#14
5R 4/14
#15
7.5RP 4/12.

77 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/266,592Filed 15 Sep 2016 · continuation
Priority: JP 2013-0422684 Mar 2013
Published: US 2017/0005240 A15 Jan 2017
Granted: 5 Sep 2017
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

H05B 45/30
Circuit arrangements for operating light-emitting diodes [LED]: driver circuits
H05B 45/20
Circuit arrangements for operating light-emitting diodes [LED]: controlling the colour of the light
H10H 20/8513
Wavelength conversion materials: having two or more wavelength conversion materials
H10H 20/857
Packages: interconnections, e.g. lead-frames, bond wires or solder balls

Family

PCT/JP2014/055388Parent of this continuation · filed 4 Mar 2014
Application14/845,436Parent of this continuation · filed 4 Sep 2015
US 2017/0005240 A1Pre-grant publication · published 5 Jan 2017
US 9,530,821 B2Parent of this continuation
US 2015/0380460 A1Published application
US 9,484,388 B2Related patent
US 9,755,118 B2This patent

From the US filing history. Foreign family members aren’t listed.